Adding some rake tasks for bumping gem versions

Rakefile

@@ -3,4 +3,30 @@ require "rspec/core/rake_task"
 
 RSpec::Core::RakeTask.new(:spec)
 
-task :default => :spec
+task :default => :spec
+
+namespace :version do
+  desc "Show the current gem version"
+  task :show do
+    system <<-SHELL
+      bump current
+    SHELL
+  end
+
+  namespace :bump do
+    desc "Bump the gem one major version"
+    task :major do
+      system "bump major"
+    end
+
+    desc "Bump the gem one minor version"
+    task :minor do
+      system "bump minor"
+    end
+
+    desc "Bump the gem one patch version"
+    task :patch do
+      system "bump patch"
+    end
+  end
+end